单项选择题 A company is using a multi-site centralized call processing model. Which feature ensures that the remote site IP phones will still have limited functionality given a WAN outage?（）

单项选择题 You are the Cisco Network Designer in Cisco.com. Your company is using the G.711 codec with 802.11a access point radios. This can support a maximum of how many phones per access point?（）

单项选择题 Scalability is provided in the server farm module by which of the following design strategies?（）